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bisect: document run behavior with exit codes 126 and 127 

Shells report non-executable and missing commands with exit codes 126
and 127, respectively.  For historical reasons "git bisect run"
interprets them as indicating a bad commit, though.  Document the
current behavior by adding basic tests that cover these cases.

Reported-by: Ramkumar Ramachandra <r@artagnon.com>
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2022-01-18 13:46:24 +01:00 committed by Junio C Hamano
parent 8efa2acc2e
commit ba5bb8152c
1 changed files with 45 additions and 0 deletions
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45
t/t6030-bisect-porcelain.sh
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@ -278,6 +278,51 @@ test_expect_success '"git bisect run" with more complex "git bisect start"' '
git bisect reset
'
test_expect_success 'bisect run accepts exit code 126 as bad' '
test_when_finished "git bisect reset" &&
write_script test_script.sh <<-\EOF &&
! grep Another hello || exit 126 >/dev/null
EOF
git bisect start &&
git bisect good $HASH1 &&
git bisect bad $HASH4 &&
git bisect run ./test_script.sh >my_bisect_log.txt &&
grep "$HASH3 is the first bad commit" my_bisect_log.txt
'
test_expect_failure POSIXPERM 'bisect run fails with non-executable test script' '
test_when_finished "git bisect reset" &&
>not-executable.sh &&
chmod -x not-executable.sh &&
git bisect start &&
git bisect good $HASH1 &&
git bisect bad $HASH4 &&
test_must_fail git bisect run ./not-executable.sh >my_bisect_log.txt &&
! grep "is the first bad commit" my_bisect_log.txt
'
test_expect_success 'bisect run accepts exit code 127 as bad' '
test_when_finished "git bisect reset" &&
write_script test_script.sh <<-\EOF &&
! grep Another hello || exit 127 >/dev/null
EOF
git bisect start &&
git bisect good $HASH1 &&
git bisect bad $HASH4 &&
git bisect run ./test_script.sh >my_bisect_log.txt &&
grep "$HASH3 is the first bad commit" my_bisect_log.txt
'
test_expect_failure 'bisect run fails with missing test script' '
test_when_finished "git bisect reset" &&
rm -f does-not-exist.sh &&
git bisect start &&
git bisect good $HASH1 &&
git bisect bad $HASH4 &&
test_must_fail git bisect run ./does-not-exist.sh >my_bisect_log.txt &&
! grep "is the first bad commit" my_bisect_log.txt
'
# $HASH1 is good, $HASH5 is bad, we skip $HASH3
# but $HASH4 is good,
# so we should find $HASH5 as the first bad commit